Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4dd860c56e090e…

MALICIOUS

PDF

101.4 KB Created: 2021-09-02 13:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fdac2646b5b635692bfc1de2d9195452 SHA-1: 0094725a43dfbd2726a94769b4a2bfe2c4de9842 SHA-256: 4d4dd860c56e090ec7ee195465a446670406e6d1513313c4e7f5bfbe6089e0a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://falerisztika.hu/tmp/temido.pdf In PDF document text
    • http://unibox.lv/files/text/69865525616.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bced4de1315---vorexegusaz.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/rofisozetetiwexa.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/67295517104.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/43655863864.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/wabidemop.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/1a38e7a8a7095933689d2c738010b646/gufinuwolik.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/bamijutupusivemut.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/21078411150.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/56020441829.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160707cda6fe4b---lilawakamukujo.pdfIn PDF document text
    • http://geoman.cz/data/file/69878816960.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/mekabupokinegami.pdfIn PDF document text
    • http://fxmeat.com/upload/file/490f76f08879d39a184ac31dcc56a21f.pdfIn PDF document text
    • https://ovalpolycoats.com/media/21481455559.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf9d87a279---xetajitosuwoxuwole.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608894b90e087---48572553529.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/6pbco68gdv8ikvk6crreufqhs1/85073522082.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/nitasaw.pdfIn PDF document text
    • http://fotossc.pl/_files/file/62709042693.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/34484891153.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b2455ca3eb2844221a4d4fd1d75e406a/69543423611.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/60493354976.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/reladi.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/71721335094.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/70746862089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=vril+power+of+the+coming+race+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12321 10952 bytes
SHA-256: be3be219b6fd49b9935d483c46afae947327ffc5f21348e1beb0a2040552d242
font_01_sfnt_off00013c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C29 19560 bytes
SHA-256: 268268bb32b25e7007ed8007bca51728defbb6376f54f6b024d60e54f5d5a54a
font_02_sfnt_off00016f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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